Fast Torpedo Caculations

[Captain_AJ]

A while back I was able to download a chart that had speeds of ships and was to point the scope .. TDC is set to zero and ( torpedo will fire at bearing zero) when you point your scope the calculations of the offset of the scope when the target hits that offset you fire .. In this chart, the scope was pointing at 15 degrees to stbd and when the target ship hit that offset AT 15 degree of zero the torpedo will intercept the target and get you a kill I used this once before and was able to accurately hit the ship. this method is useful against Escort's

I am not finding this chart anyone has a clue as to where I can find this chart again?